我有一个ListView适配器，可以扩展视图以在ListView中显示。当我尝试使用FindViewById（Resource.Id.ItemId）从View中获取一些项目时，调试器抛出并错误地说：
＆＃34; System.InvalidCastException：无法转换类型的实例＆＃39; Android.Widget.TableRow＆＃39;输入＆＃39; Android.Widget.TextView＆＃39; ＆＃34;
我知道我使用的资源ID应映射到TextView。
还有一些问题，其中一些项目永远不会将值放在其中，因此始终显示其默认值。
这是axml：
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="25px"
android:minHeight="25px"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tripViewTableLayout"
android:showDividers="beginning">
<TableRow
android:id="@+id/tripViewTableRow1"
android:layout_width="match_parent"
android:showDividers="none"
android:gravity="left">
<TextView
android:text="Servive Level"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/tripViewServiceLevel"
android:textSize="10dp"
android:layout_column="0"
android:layout_gravity="left"
android:layout_weight="0.4"
android:maxEms="1"
android:lines="1"
android:editable="false"
android:singleLine="true" />
<TextView
android:text="Package Type"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/tripViewPackageType"
android:textSize="10dp"
android:layout_gravity="left"
android:layout_weight="0.4"
android:maxEms="1"
android:lines="1"
android:editable="false"
android:singleLine="true"
android:layout_column="1" />
<TextView
android:text="Weight"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/tripViewWeight"
android:textSize="10dp"
android:ellipsize="end"
android:gravity="left"
android:layout_gravity="left"
android:layout_weight="0.1"
android:maxEms="1"
android:lines="1"
android:editable="false"
android:singleLine="true"
android:layout_column="2" />
<TextView
android:text="Due Time"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/tripViewDueTime"
android:textSize="10dp"
android:gravity="left"
android:editable="false"
android:lines="1"
android:ellipsize="end"
android:singleLine="true"
android:layout_gravity="left"
android:layout_weight="0.1"
android:includeFontPadding="false"
android:layout_width="match_parent"
android:maxEms="1"
android:layout_marginTop="3dp"
android:layout_column="3" />
</TableRow>
<TableRow
android:id="@+id/tripViewTableRow2"
android:layout_width="match_parent"
android:minWidth="25px"
android:minHeight="25px">
<ImageView
android:src="@drawable/orangebar"
android:layout_column="0"
android:id="@+id/tripViewImageBar"
android:layout_height="match_parent"
android:scaleType="fitStart"
android:cropToPadding="false"
android:layout_width="5dp" />
<LinearLayout
android:orientation="vertical"
android:minWidth="25px"
android:minHeight="25px"
android:id="@+id/tripViewLinearLayout1"
android:layout_column="1"
android:layout_span="3"
android:layout_weight="1"
android:layout_gravity="left"
android:layout_width="match_parent">
<TextView
android:text="Company"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/tripViewCompanyName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="15dp"
android:lines="1"
android:maxEms="1"
android:editable="false" />
<TextView
android:text="Address"
android:textAppearance="?android:attr/textAppearanceSmall"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tripViewCompanyAddress"
android:editable="false"
android:maxLines="1" />
</LinearLayout>
</TableRow>
</TableLayout>
以下是代码：
using System.Collections.Generic;
using Android.App;
using Android.Views;
using Android.Widget;
using RemoteService.Model;
namespace Driod2.Trips
{
public class TripListAdapter : BaseAdapter<Trip>
{
private readonly List<Trip> Trips;
private readonly Activity Context;
public override long GetItemId( int position ) { return position; }
public override View GetView( int position, View convertView, ViewGroup parent )
{
var T = Trips[ position ];
var Row = convertView ?? Context.LayoutInflater.Inflate( Resource.Layout.TripListViewRow, null ); // re-use an existing view, if one is available
Row.FindViewById<TextView>( Resource.Id.tripViewServiceLevel ).Text = T.ServiceLevel;
Row.FindViewById<TextView>( Resource.Id.tripViewPackageType ).Text = T.PackageType;
// !!!! The Error Happens here !!!!!!
Row.FindViewById<TextView>( Resource.Id.tripViewWeight ).Text = T.Weight.ToString( "F" );
// !!!! If I don't get the error the the next 4 never change !!!!!!
Row.FindViewById<TextView>( Resource.Id.tripViewDueTime ).Text = T.DueTime.ToShortTimeString();
Row.FindViewById<ImageView>( Resource.Id.tripViewImageBar ).SetImageResource( Resource.Drawable.BlueBar );
Row.FindViewById<TextView>( Resource.Id.tripViewCompanyName ).Text = T.DeliveryCompany;
Row.FindViewById<TextView>( Resource.Id.tripViewCompanyAddress ).Text = T.DeliveryCompanyAddressId.ToString();
return Row;
}
public override int Count => Trips.Count;
public override Trip this[ int position ] => Trips[ position ];
public TripListAdapter( Activity context, List<Trip> trips )
{
Context = context;
Trips = trips;
}
}
}
自动生成的资源：
#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.42000
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
[assembly: global::Android.Runtime.ResourceDesignerAttribute("Driod2.Resource", IsApplication=true)]
namespace Driod2
{
[System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Android.Build.Tasks", "1.0.0.0")]
public partial class Resource
{
static Resource()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
public static void UpdateIdValues()
{
global::IdsRemoteService.Resource.String.ApplicationName = global::Driod2.Resource.String.ApplicationName;
global::IdsRemoteService.Resource.String.Hello = global::Driod2.Resource.String.Hello;
global::RemoteService.Resource.String.ApplicationName = global::Driod2.Resource.String.ApplicationName;
global::RemoteService.Resource.String.Hello = global::Driod2.Resource.String.Hello;
}
public partial class Attribute
{
static Attribute()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Attribute()
{
}
}
public partial class Color
{
// aapt resource value: 0x7f060000
public const int AliceBlue = 2131099648;
// aapt resource value: 0x7f060001
public const int SteelBlue = 2131099649;
static Color()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Color()
{
}
}
public partial class Drawable
{
// aapt resource value: 0x7f020000
public const int BlueBar = 2130837504;
// aapt resource value: 0x7f020001
public const int BottomBorder = 2130837505;
// aapt resource value: 0x7f020002
public const int CaratDownWhite = 2130837506;
// aapt resource value: 0x7f020003
public const int CloudWhite = 2130837507;
// aapt resource value: 0x7f020004
public const int ForwardWhite = 2130837508;
// aapt resource value: 0x7f020005
public const int Icon = 2130837509;
// aapt resource value: 0x7f020006
public const int offline32x32 = 2130837510;
// aapt resource value: 0x7f020007
public const int online32x32 = 2130837511;
// aapt resource value: 0x7f020008
public const int OrangeBar = 2130837512;
static Drawable()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Drawable()
{
}
}
public partial class Id
{
// aapt resource value: 0x7f07000c
public const int accountId = 2131165196;
// aapt resource value: 0x7f070003
public const int appTitle = 2131165187;
// aapt resource value: 0x7f070000
public const int baseLayout = 2131165184;
// aapt resource value: 0x7f07000a
public const int button1 = 2131165194;
// aapt resource value: 0x7f070014
public const int filter1Button = 2131165204;
// aapt resource value: 0x7f070015
public const int filter2Button = 2131165205;
// aapt resource value: 0x7f070016
public const int filter3Button = 2131165206;
// aapt resource value: 0x7f070001
public const int frameLayout1 = 2131165185;
// aapt resource value: 0x7f070002
public const int gridLayout1 = 2131165186;
// aapt resource value: 0x7f070005
public const int linearLayout2 = 2131165189;
// aapt resource value: 0x7f070013
public const int linearLayout3 = 2131165203;
// aapt resource value: 0x7f070008
public const int loginLayout = 2131165192;
// aapt resource value: 0x7f070007
public const int mainViewFlipper = 2131165191;
// aapt resource value: 0x7f070010
public const int password = 2131165200;
// aapt resource value: 0x7f070006
public const int pingIcon = 2131165190;
// aapt resource value: 0x7f070011
public const int signInButton = 2131165201;
// aapt resource value: 0x7f070009
public const int textView2 = 2131165193;
// aapt resource value: 0x7f07000b
public const int textView3 = 2131165195;
// aapt resource value: 0x7f07000d
public const int textView4 = 2131165197;
// aapt resource value: 0x7f07000f
public const int textView5 = 2131165199;
// aapt resource value: 0x7f070004
public const int tripCount = 2131165188;
// aapt resource value: 0x7f070012
public const int tripLayout = 2131165202;
// aapt resource value: 0x7f070017
public const int tripListView = 2131165207;
// aapt resource value: 0x7f070022
public const int tripViewCompanyAddress = 2131165218;
// aapt resource value: 0x7f070021
public const int tripViewCompanyName = 2131165217;
// aapt resource value: 0x7f07001d
public const int tripViewDueTime = 2131165213;
// aapt resource value: 0x7f07001f
public const int tripViewImageBar = 2131165215;
// aapt resource value: 0x7f070020
public const int tripViewLinearLayout1 = 2131165216;
// aapt resource value: 0x7f07001b
public const int tripViewPackageType = 2131165211;
// aapt resource value: 0x7f07001a
public const int tripViewServiceLevel = 2131165210;
// aapt resource value: 0x7f070018
public const int tripViewTableLayout = 2131165208;
// aapt resource value: 0x7f070019
public const int tripViewTableRow1 = 2131165209;
// aapt resource value: 0x7f07001e
public const int tripViewTableRow2 = 2131165214;
// aapt resource value: 0x7f07001c
public const int tripViewWeight = 2131165212;
// aapt resource value: 0x7f07000e
public const int userName = 2131165198;
static Id()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Id()
{
}
}
public partial class Layout
{
// aapt resource value: 0x7f030000
public const int Main = 2130903040;
// aapt resource value: 0x7f030001
public const int TripListViewRow = 2130903041;
static Layout()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Layout()
{
}
}
public partial class Raw
{
// aapt resource value: 0x7f040000
public const int BadScan = 2130968576;
// aapt resource value: 0x7f040001
public const int DeletedTrip = 2130968577;
// aapt resource value: 0x7f040002
public const int NewTrip = 2130968578;
static Raw()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private Raw()
{
}
}
public partial class String
{
// aapt resource value: 0x7f050001
public const int ApplicationName = 2131034113;
// aapt resource value: 0x7f050000
public const int Hello = 2131034112;
static String()
{
global::Android.Runtime.ResourceIdManager.UpdateIdValues();
}
private String()
{
}
}
}
}
#pragma warning restore 1591
有人知道自动生成的资源与Android充气视图不同步的原因吗？
答案 0 :(得分：0)
不确定，但可能是你看错了？
var Row = convertView ?? Context.LayoutInflater.Inflate(Resource.Layout.TripListViewRow, null );
实际上是为您提供TableLayout，而不是TableRow。要获得实际的TableRow，您可能需要这样做
TableRow actualRow1 = Row.FindViewById<TableRow>(Resource.Id.tripViewTableRow1 );
TableRow actualRow2 = Row.FindViewById<TableRow>(Resource.Id.tripViewTableRow2 );
然后在TextView和actualRow1中查找您的actualRow2等。